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Old 26th March 2012, 06:45 PM   #1
graygem is offline graygem  United States
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Default Preamp output protection

I have a preamp circuit that will be connected to a class D amplifier. The class D amp has a input voltage up to 5v. I need to limit my preamp from going any higher than this 5v. What is the simplest way to accomplish this? Also, this is a single supply preamp and class d amp.
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Last edited by graygem; 26th March 2012 at 06:53 PM.
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Old 26th March 2012, 06:52 PM   #2
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Back to back zener diodes.

This is a common practice with MOS-FET amps.

Either look at the http://www.passdiy.com or http://www.kk-pcb.com sites to see how it is done with very High End amps.

Last edited by KatieandDad; 26th March 2012 at 06:55 PM.
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Old 26th March 2012, 06:52 PM   #3
DF96 is offline DF96  England
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Don't turn up the volume too high? A bit too much input will cause clipping which is likely to sound horrible long before it does any damage.
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Old 26th March 2012, 06:54 PM   #4
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Best way is to set the gain in the preamp stage so that with your highest output signal source the output levels don't go above 5V.
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Old 27th March 2012, 07:54 PM   #5
graygem is offline graygem  United States
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Thank you
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Old 27th March 2012, 08:03 PM   #6
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It realy depends on little fingers.

Do you want BOMB PROOF or justr SAFE ?
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